Sludge recovery device

Abstract

This technology provides an effective way to improve the maintainability of tanks that contain sludge. [Solution] The sludge recovery device 12 includes a tank 121 having a tank body 1211 for containing a fluid containing sludge, and a bracket 1212 that defines a columnar space 1213 above the open top surface of the tank body 1211, and an introduction pipe 122 for guiding the fluid into the tank 121, having a lid 1222 that is detachably fitted to the bracket 1212 and formed to fill the space 1213. In the process of separating the bracket 1212 from the lid 1222, the sludge separation and recovery device 10 allows the fluid remaining inside the introduction pipe 122 to flow into the space 1213.

Description

Technical Field

[0001] The present invention relates to a sludge recovery device for recovering sludge.

Background Art

[0002] Patent Document 1 discloses a sludge separation and removal device including a bottomed cylindrical container main body, a top plate portion fixed to the upper surface of the container main body by a catch clip to seal the inside of the container main body, and an air release valve provided on the upper side wall of the container main body. When removing the top plate from the container main body, the inside of the container main body is opened from a negative pressure state to an atmospheric state by opening the air release valve.

[0003] Patent Document 2 discloses a box for recovering cutting fluid that is divided before and after or up and down, and one or two sets of locking fittings are attached to the divided box, and one of the divided boxes is detachable or openable / closable via the locking fittings.

[0004] Patent Document 3 discloses a bottomed cylindrical float guide fixed to the top cover of a filter device provided in a machining fluid supply path, including one or more windows provided around the bottom surface and the lower surface of the top cover of the float guide, a float loosely fitted inside the float guide, a conduit provided on the top cover at the center of the float guide and communicating with a machining fluid tank via a check valve, and a poppet valve provided at the upper center of the float and engaging with a dish hole at the lower end of the conduit.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0006] Incidentally, when performing maintenance on the devices described in Patent Documents 1-3, separating the device from the fluid flow path containing sludge could cause residual fluid in the flow path to leak out. In that case, the leaked fluid could contaminate surrounding equipment and the hands of workers, leading to a decrease in maintainability.

[0007] This invention was made in view of the circumstances described above, and its purpose is to provide a technology that is effective in improving the maintainability of tanks that contain sludge. [Means for solving the problem]

[0008] One aspect of the present invention is a sludge recovery device comprising a tank body for containing a fluid containing sludge, and a tank having a bracket that defines a columnar space above the open top surface of the tank body, and an introduction pipe for guiding the fluid into the tank, having a lid that is detachably fitted to the bracket and formed to fill the space, characterized in that, in the process of separating the bracket from the lid, the fluid remaining inside the introduction pipe flows into the space.

[0009] In a sludge recovery apparatus according to one aspect of the present invention, when a fluid containing sludge is collected in a tank, the bracket is fitted to the lid so that the lid is inserted into the space. This allows the tank to be connected to the inlet pipe. When the bracket is fitted to the lid, the space is filled by the lid. In this state, the fluid discharged from the preceding device (for example, a device for separating sludge from industrial coolant, etc.) (for example, a liquid mixture of industrial coolant, etc. and sludge) is contained inside the tank body through the introduction pipe.

[0010] In a sludge recovery apparatus according to one aspect of the present invention, when performing maintenance on the tank (for example, removing sludge from inside the tank body and / or cleaning the tank body), the bracket is separated from the lid so that the lid can be removed from the space in the bracket. This allows the tank to be separated from the inlet pipe. When such work is performed, the discharge of the fluid from the preceding apparatus is stopped, but there is a possibility that the fluid remains inside the inlet pipe. It is also conceivable to provide a valve in the middle of the inlet pipe to switch between conducting and blocking the passage inside the inlet pipe, but the fluid may remain inside the inlet pipe downstream of the valve. Therefore, when separating the tank from the inlet pipe, there is a possibility that the fluid remaining inside the inlet pipe (hereinafter sometimes referred to as "residual fluid") may flow out from the outlet of the inlet pipe. In contrast, in a sludge recovery device, which is one embodiment of the present invention, during the process of separating the bracket from the lid, a region of the space defined by the bracket that is not filled by the lid (hereinafter sometimes referred to as the "empty region") is created, and this empty region gradually expands. As a result, residual fluid that has flowed out from the outlet of the inlet pipe can be allowed to flow into the empty region of the space. Since the empty region of the space is surrounded by the bracket, the residual fluid that flows into the empty region is accumulated in the empty region without leaking to the outside. As a result, contamination of the operator's hands and surrounding equipment by residual fluid can be suppressed.

[0011] Furthermore, when separating the tank and the inlet pipe, the inside of the tank body may be under negative pressure. In response to this, a sludge recovery device, which is one embodiment of the present invention, may further be provided with a negative pressure valve that opens when the pressure inside the tank body is below a predetermined pressure lower than atmospheric pressure while the bracket is fitted to the lid, thereby allowing air to flow into the inside of the tank body. As a result, when separating the tank and the inlet pipe, if the pressure inside the tank body is below a predetermined pressure lower than atmospheric pressure, the negative pressure valve opens, allowing air to flow into the inside of the tank body, thereby reducing the pressure difference between the inside and outside (in the atmosphere) of the tank body. Consequently, when separating the tank and the inlet pipe, the operator can separate the bracket from the lid with less force.

[0012] Furthermore, in a sludge recovery device according to one aspect of the present invention, the lid may further include an air reservoir that communicates with the inside of the tank body when the bracket is fitted to the lid. With such a configuration, as the amount of fluid increases during the process of the fluid being contained inside the tank body, the air inside the tank body is pushed into (compressed) the air reservoir. Then, when separating the tank from the inlet pipe, the air that was pushed into the air reservoir flows into the inside of the tank body. As a result, when an operator separates the tank from the inlet pipe, the pressure difference between the inside and outside of the tank body can be reduced more reliably and quickly due to the synergistic effect of the inflow of air into the inside of the tank body due to the opening of the negative pressure valve and the inflow of air from the air reservoir into the inside of the tank body.

[0013] Furthermore, in a sludge recovery device according to one aspect of the present invention, a sealing member may be provided at the portion of the lid that fits with the bracket. With such a configuration, the airtightness and liquid tightness of the fitting portion between the lid and the bracket can be improved. In particular, sludge and dust that could not be completely removed during maintenance may adhere to the fitting portion. In some cases, it is possible to prevent the fluid contained inside the tank body and the residual fluid flowing out from the outlet of the introduction pipe from leaking out of the tank body from the fitting portion.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a technique effective in improving the maintainability of a tank for storing sludge.

Brief Description of the Drawings

[0015] [Figure 1] It is a diagram showing an example of a machine tool in an embodiment. [Figure 2] It is a perspective view showing an example of the overall configuration of a sludge separation and recovery device in an embodiment. [Figure 3] It is a first cross-sectional view showing an example of the configuration of a sludge recovery device in an embodiment. [Figure 4] It is a second cross-sectional view showing an example of the configuration of a sludge recovery device in an embodiment. [Figure 5] It is a diagram showing the flow of fluid when storing sludge in a tank in an embodiment. [Figure 6] It is a diagram showing the state of a sludge recovery device when separating a tank and an introduction pipe in an embodiment.

Modes for Carrying Out the Invention

[0016] Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention only to those, unless otherwise specified.

[0017] <Embodiment> FIG. 1 is a diagram showing an example of a machine tool 1 to which the sludge recovery device according to the present invention is applied. The machine tool 1 is a machine for machining a workpiece. The machine tool 1 in the present embodiment is a machine lubricated, cooled, and / or washed with a liquid fluid. The fluid may be, for example, an industrial coolant such as cutting fluid. Also, the machine tool 1 may be, for example, a machining center or the like. Note that the machine tool 1 is not particularly limited as long as it is a machine tool that uses the above-described fluid. A sludge separation and recovery device 10 is provided in the machine tool 1 in the present embodiment. The sludge separation and recovery device 10 is a device that separates sludge contained in the fluid and collects the separated sludge.

[0018] (Sludge separation and recovery device) FIG. 2 is a diagram showing an example of the overall configuration of the sludge separation and recovery device 10 in the present embodiment. The sludge separation and recovery device 10 in the present embodiment is configured to include a sludge separation device 11 and a sludge recovery device 12.

[0019] The sludge separation device 11 is a device that separates sludge from the fluid (coolant containing sludge) pumped up from the dirty tank of the machine tool 1. The sludge separation device 11 illustrated in FIG. 2 is a centrifugal separation type device. However, the sludge separation device 11 is not limited to the centrifugal separation type and can be changed according to the embodiment. Among the fluid flowing into the sludge separation device 11, the fluid (coolant) separated from the sludge by the sludge separation device 11 is sent to the clean tank of the machine tool 1, and the remaining fluid (coolant containing sludge) is discharged toward the sludge recovery device 12.

[0020] The sludge recovery device 12 is the fluid discharged from the sludge separation device 11 (containing sludge) This is a device for recovering coolant. The sludge recovery device 12 in this embodiment consists of a tank 121 and an inlet pipe 122. The tank 121 is a container for holding the fluid discharged from the sludge separation device 11. The inlet pipe 122 is a pipe that forms a passage for guiding the fluid discharged from the sludge separation device 11 to the tank 121. A cock 123 is provided in the middle of the inlet pipe 122. The cock 123 is a valve device for manually switching between opening and closing the passage in the inlet pipe 122. Note that the cock 123 is not limited to a manual type, but may be an electric type or an air-driven type.

[0021] In the sludge separation and recovery device 10 configured as described above, when the sludge separation device 11 is operated with the cock 123 open, the fluid (coolant containing sludge) is discharged from the sludge separation device 11 into the inlet pipe 122. The fluid discharged from the sludge separation device 11 into the inlet pipe 122 is then collected in the tank 121 through the inlet pipe 122.

[0022] (Sludge recovery device) Next, the specific configuration of the sludge recovery device 12 in this embodiment will be described with reference to Figures 3 and 4. Figure 3 is a first cross-sectional view showing an example of the configuration of the sludge recovery device 12 in this embodiment. Figure 4 is a second cross-sectional view showing an example of the configuration of the sludge recovery device 12 in this embodiment.

[0023] As described above, the sludge recovery device 12 in this embodiment is composed of a tank 121 and an inlet pipe 122. Figure 3 shows the state in which the tank 121 and the inlet pipe 122 are separated. Figure 4 shows the state in which the tank 121 and the inlet pipe 122 are connected.

[0024] [tank] Here, the configuration of the tank 121 in this embodiment will be described. The tank 121 in this embodiment is composed of a tank body 1211 and a bracket 1212. The tank body 1211 is a container for containing the fluid discharged from the sludge separation device 11, and is formed so that its top surface is open. In the example shown in Figures 2 to 4, the tank body 1211 has a substantially cylindrical shape, but the shape of the tank body 1211 is not limited to the shape exemplified in Figures 2 to 4.

[0025] The bracket 1212 is provided on the upper part of the tank body 1211 and is a component for fixing the tank body 1211 to the inlet pipe 122. In one example, the bracket 1212 may be formed in a substantially cylindrical shape that extends upward from the upper part of the tank body 1211, as illustrated in Figures 3 and 4. In that case, the bracket 1212 may be configured to have an outer diameter larger than the outer diameter of the tank body 1211. The outer diameter of the bracket 1212 may be uniform in the axial direction of the bracket 1212. Also, the bracket 1212 may be configured such that the inner diameter on the upper axial side is smaller than the inner diameter on the lower axial side. In other words, the bracket 1212 may be configured such that the inner diameter of the axially lower side of the bracket 1212 (hereinafter sometimes referred to as the "large inner diameter section") is equal to or slightly larger than the outer diameter of the tank body 1211, and the inner diameter of the axially upper side of the bracket 1212 (hereinafter sometimes referred to as the "small inner diameter section") is approximately equal to the inner diameter of the tank body 1211. The shape of the bracket 1212 is not limited to a roughly cylindrical shape and may be appropriately changed according to the shape of the tank body 1211.

[0026] As described above, the bracket 1212 is fitted to the tank body 1211 in such a way that the upper part of the tank body 1211 is inserted into the large inner diameter portion of the bracket 1212, as shown in Figure 3. As a result, a cylindrical space 1213 is defined above the top surface of the tank body 1211, surrounded by the small inner diameter portion of the bracket 1212. Furthermore, the stepped portion on the inner circumferential surface of the bracket 1212 (the stepped portion between the small inner diameter portion and the large inner diameter portion) and the tank body 1211 An annular sealing member (e.g., an O-ring) 1214 is positioned between the upper end surface of the bracket 1212 and the tank body 1211 to improve airtightness and liquid tightness at the fitting portion between the bracket 1212 and the tank body 1211. Screw threads and grooves that engage with each other may be formed on the inner circumferential surface of the large inner diameter portion of the bracket 1212 and the outer circumferential surface of the upper part of the tank body 1211. In this case, the bracket 1212 can be made less likely to come off the tank body 1211. Alternatively, the bracket 1212 and the tank body 1211 may be integrally molded. In this case, the sealing member 1214 may be omitted.

[0027] [Introduction pipe] Next, the configuration of the inlet pipe 122 in this embodiment will be described. The inlet pipe 122 in this embodiment consists of an inlet pipe body 1221, a lid 1222, a negative pressure valve 1223, and an air reservoir 1224. The inlet pipe body 1221 is a pipe that forms a passage for guiding the fluid (coolant containing sludge) discharged from the sludge separation device 11 to the tank 121.

[0028] The lid 1222 is a component for liquid-tightly connecting the inlet pipe 122 and the tank 121, and is configured to be detachably fitted to the bracket 1212 of the tank 121. In one example, the lid 1222 may be provided at the outlet portion of the inlet pipe body 1221 (the lower portion of the inlet pipe body 1221 in Figures 3 and 4), as illustrated in Figures 3 and 4, and may be formed in an annular shape that surrounds the outer circumferential surface of the inlet pipe body 1221. In that case, the lid 1222 may be configured such that the outer diameter on the axial lower side is smaller than the outer diameter on the axial upper side. In other words, the lid 1222 may be constructed such that the outer diameter of the axially lower side of the lid 1222 (hereinafter sometimes referred to as the "small outer diameter portion") is equal to or slightly smaller than the inner diameter of the small inner diameter portion of the bracket 1212, and the outer diameter of the axially upper side of the lid 1222 (hereinafter sometimes referred to as the "large outer diameter portion") is approximately equal to the outer diameter of the bracket 1212. Furthermore, an annular groove 1225 extending in the circumferential direction may be formed on the outer circumferential surface of the small outer diameter portion of the lid 1222, and an annular sealing member (for example, an O-ring) 1226 may be fitted thereon.

[0029] The inlet pipe body 1221 and the lid 1222 may be configured to be detachable or integrally molded. If the inlet pipe body 1221 and the lid 1222 are configured to be detachable, threads and grooves that screw into each other may be formed on the lower outer circumferential surface of the inlet pipe body 1221 and the inner circumferential surface of the lid 1222.

[0030] Here, when connecting the tank 121 to the inlet pipe 122, as shown in Figure 4, the bracket 1212 of the tank 121 is fitted to the lid 1222 in such a way that the small outer diameter portion of the lid 1222 is inserted into the small inner diameter portion (space 1213) of the bracket 1212. Then, with the upper end surface of the bracket 1212 in contact with the stepped portion between the small outer diameter portion and the large outer diameter portion of the lid 1222, the bracket 1212 and the lid 1222 are fixed by two or more sets of fasteners 124. In one example, the fasteners 124 may be a combination of a snap lock 1241 and a receiving bracket 1242, as illustrated in Figures 3 and 4. In this case, the snap lock 1241 may be attached to two or more places on the outer circumferential surface of the large outer diameter portion of the lid 1222. Accordingly, the receiving bracket 1242 may be attached to two or more places on the outer circumferential surface of the bracket 1212. These two or more sets of snap locks 1241 and receiving brackets 1242 should be positioned so that each set of snap locks 1241 and receiving brackets 1242 engages with each other. More specifically, each set of snap locks 1241 and receiving brackets 1242 should be positioned so that the upper end surface of the bracket 1212 abuts against the stepped portion between the small outer diameter portion and the large outer diameter portion of the cover 1222 and engages with each other.

[0031] When the bracket 1212 and the lid 1222 are fitted and fixed to each other as described above, the top opening of the tank body 1211 is sealed liquid-tight by the lid 1222, and the passage inside the inlet pipe body 1221 and the inside of the tank body 1211 are sealed liquid-tight. They are in communication. Also, when the bracket 1212 and the cover 1222 are fitted and fixed to each other, as shown in Figure 4, the space 1213 defined inside the bracket 1212 is filled by the small outer diameter portion of the cover 1222.

[0032] The fastener 124 is not limited to a combination of a snap lock 1241 and a receiving bracket 1242, and can be modified as appropriate depending on the embodiment. In one example, the fastener 124 may be a combination of a spring-loaded hook and a receiving bracket. Also, the shape of the lid 1222 may be modified as appropriate depending on the shape of the tank body 1211 and the bracket 1212.

[0033] The negative pressure valve 1223 is provided on the lid 1222 and is a valve device that opens when the internal pressure of the tank body 1211 falls below a predetermined pressure lower than atmospheric pressure while the bracket 1212 is fitted and fixed to the lid 1222 (as shown in Figure 4), allowing air (atmosphere) to flow into the tank body 1211 from the atmosphere. In one example, the negative pressure valve 1223 may be configured to switch between communication and blockage between the upper and lower parts of the lid 1222, as shown in Figures 3 and 4. In one example, the predetermined pressure may be a pressure at which it becomes difficult to easily separate the bracket 1212 and the lid 1222 when the internal pressure of the tank body 1211 falls below the predetermined pressure (for example, it becomes difficult for a worker to separate the bracket 1212 from the lid 1222 with one hand). Note that the arrangement and shape of the negative pressure valve 1223 are not limited to the arrangement and shape exemplified in Figures 3 and 4, as long as it performs the function described above.

[0034] The air reservoir 1224 is provided on the lid 1222 and is configured to collect air inside the tank body 1211 when the bracket 1212 is fitted and fixed to the lid 1222 (as shown in Figure 4). In one example, the air reservoir 1224 may be a columnar space extending parallel to the axial direction of the lid 1222 from a hole provided on the bottom surface of the lid 1222 to the inside of the lid 1222. The air reservoir 1224 configured in this way communicates with the inside of the tank body 1211 when the bracket 1212 is fitted and fixed to the lid 1222 (as shown in Figure 4). In the example shown in Figures 3 and 4, there is only one air reservoir 1224 provided on the lid 1222, but two or more air reservoirs 1224 may be provided on the lid 1222. In that case, two or more air pockets 1224 may be arranged in a ring shape centered on the inlet pipe body 1221 in a plan view.

[0035] (Sludge collection) When operating the sludge separation device 11 in this embodiment, the tank 121 is connected to the inlet pipe 122 as shown in Figure 4. When connecting the tank 121 to the inlet pipe 122, first, the tank 121 is lifted from below the inlet pipe 122 toward the axial upward direction so that the small outer diameter portion of the lid 1222 is inserted into the small inner diameter portion (space 1213) of the bracket 1212. At that time, the tank 121 is lifted until the upper end surface of the bracket 1212 abuts against the stepped portion between the small outer diameter portion and the large outer diameter portion of the lid 1222, thereby fitting the bracket 1212 to the lid 1222. Next, with the upper end surface of the bracket 1212 in contact with the stepped portion between the small outer diameter portion and the large outer diameter portion of the lid 1222, the snap lock 1241 attached to the lid 1222 is engaged with the receiving fitting 1242 attached to the bracket 1212, thereby fixing the bracket 1212 and the lid 1222 together. As a result, the tank 121 and the inlet pipe 122 are connected to each other, and the passage inside the inlet pipe 122 and the inside of the tank body 1211 are in liquid-tight communication.

[0036] After the tank 121 and the inlet pipe 122 are connected as described above, the cock 123 is opened and the sludge separation device 11 is activated. When the sludge separation device 11 is activated with the cock 123 open, as shown in Figure 5, the fluid discharged from the sludge separation device 11 (coolant containing sludge) is introduced into the tank body 1211 through the passage in the inlet pipe 122 (white arrow in Figure 5). At that time, inside the bracket 1212 Since the defined space 1213 is filled by the small outer diameter portion of the lid 1222, very little fluid accumulates in the space 1213. Furthermore, as the amount of fluid contained inside the tank body 1211 increases, the air inside the tank body 1211 is pushed into the air reservoir 1224 and compressed within the air reservoir 1224.

[0037] In this embodiment, the sludge recovery device 12 is fitted with sealing members 1214 and 1226 at the fitting portion between the bracket 1212 and the tank body 1211, and at the fitting portion between the lid 1222 and the bracket 1212, respectively. This prevents the fluid contained inside the tank body 1211 from leaking out to the outside of the tank body 1211 through the fitting portions. In particular, even if sludge, dust, etc. that could not be completely removed during maintenance of the tank 121 are adhering to the outer surface of the small outer diameter portion of the lid 1222 or the inner surface of the small inner diameter portion of the bracket 1212, the airtightness and liquid tightness of the fitting portions can be ensured. As a result, the leakage of fluid inside the tank body 1211 to the outside of the tank body 1211 through the fitting portions can be more reliably suppressed.

[0038] (Tank maintenance) When performing maintenance on tank 121, first, the operation of the sludge separation device 11 is stopped and the cock 123 is closed. Next, as shown in Figure 3, the tank 121 and the inlet pipe 122 are separated. When separating the tank 121 and the inlet pipe 122, the bracket 1212 is separated from the lid 1222 as shown in Figure 3. Specifically, first, the engagement between the snap lock 1241 and the receiving fitting 1242 is released. Next, the tank 121 is pulled down toward the bottom (axially downward) of the inlet pipe 122 so that the small outer diameter part of the lid 1222 comes out of the small inner diameter part of the bracket 1212. At this time, if the pressure inside the tank body 1211 is below a predetermined pressure, the negative pressure valve 1223 will open automatically, allowing air (atmosphere) to flow into the tank body 1211. Furthermore, the air that is forced into the air reservoir 1224 during the process of filling the tank body 1211 with fluid is released into the tank body 1211 when the bracket 1212 is separated from the lid 1222. As a result, the synergistic action of the negative pressure valve 1223 and the air reservoir 1224 makes it possible to reduce the pressure difference between the inside and outside of the tank body 1211 more reliably and quickly. This allows maintenance workers to separate the bracket 1212 from the lid 1222 with less force.

[0039] Furthermore, when separating the bracket 1212 from the lid 1222, the fluid remaining in the inlet pipe 122 downstream of the cock 123 (residual fluid) may flow out from the outlet of the inlet pipe 122, as shown in Figure 6. In contrast, in the sludge recovery device 12 of this embodiment, during the process of separating the bracket 1212 from the lid 1222, the area of ​​the space 1213 defined inside the bracket 1212 that is not filled by the small outer diameter portion of the lid 1222 (empty area) gradually expands. That is, during the process of separating the bracket 1212 from the lid 1222, an empty area is created above the top surface (opening) of the tank body 1211, and this empty area gradually expands. As a result, the residual fluid flowing out from the outlet of the inlet pipe 122 flows into the empty area (white arrow in Figure 6). Since the area surrounding the above-mentioned empty space is enclosed by the small inner diameter portion of the bracket 1212, the sludge is accumulated in the empty space without leaking to the outside of the sludge recovery device 12. Furthermore, when the bracket 1212 is separated from the lid 1222, there is a possibility that residual fluid may flow out forcefully from the outlet of the inlet pipe 122, but at that point, the gap between the small inner diameter portion of the bracket 1212 and the small outer diameter portion of the lid 1222 is sealed by the sealing member 1226. Therefore, even if residual fluid flows out forcefully from the outlet of the inlet pipe 122 when the bracket 1212 is separated from the lid 1222, leakage of the residual fluid to the outside is suppressed. As a result, contamination of surrounding equipment of the sludge recovery device 12 and the hands of the operator with residual fluid can be suppressed. Note that the dimensions of the bracket 1212 and the lid 1222 (for example, the inner diameter and axial length of the small inner diameter portion of the bracket 1212, and the small outer diameter of the lid 1222) The outer diameter and axial length of the section should be designed so that the volume of the space 1213 is greater than the volume of the inlet pipe 122 downstream of the cock 123 (amount of residual fluid). In this case, the entire amount of residual fluid can be stored in the space 1213 (empty area) without leaking to the outside.

[0040] According to the embodiments described above, the maintainability of the tank 121 can be improved without causing problems when sludge (coolant containing sludge) is stored in the tank 121.

[0041] <Other> In the embodiment described above, an example was given in which the lid 1222 is equipped with a negative pressure valve 1223 and an air reservoir 1224. However, the lid 1222 only needs to be equipped with at least the negative pressure valve 1223 among the negative pressure valve 1223 and the air reservoir 1224. Even in such a configuration, when separating the tank 121 and the inlet pipe 122, if the pressure inside the tank body 1211 is below a predetermined pressure, the negative pressure valve 1223 will open automatically, thereby reducing the pressure difference between the inside and outside of the tank body 1211. [Explanation of Symbols]

[0042] 1 Machine tools 10. Sludge separation and recovery device 11. Sludge Separation Unit 12. Sludge recovery device 121 Tank 1211 Tank body 1212 Bracket 1213 Space section 1214 Sealing component 122 Introductory tube 1221 Inlet pipe body 1222 Lid 1223 Negative pressure valve 1224 Air pocket section 1225 Ring groove 1226 Sealing component 123 Cook 124 Fixtures 1241 Pachinko 1242 Mounting bracket

Claims

1. A tank having a tank body for containing a fluid containing sludge, and a bracket that defines a columnar space above the open top surface of the tank body, It has a lid that is detachably fitted to the bracket and formed to fill the space, and an introduction pipe for guiding the fluid to the tank, A sludge recovery device comprising, The process of separating the bracket from the cover is characterized in that the fluid remaining inside the introduction pipe flows into the space, Sludge recovery device.

2. The lid further includes a negative pressure valve that opens when the pressure inside the tank body is below a predetermined pressure lower than atmospheric pressure, while the bracket is fitted to the lid, thereby allowing air to flow into the tank body. The sludge recovery apparatus according to claim 1.

3. The lid further includes an air reservoir that communicates with the inside of the tank body when the bracket is fitted to the lid. A sludge recovery apparatus according to claim 1 or 2.

4. A sealing member is provided at the portion of the cover that fits with the bracket. A sludge recovery apparatus according to claim 1 or 2.

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